Power calibration of multiple light sources in a display screen

Abstract

A display device with multiple light sources includes a first detector for detecting a brightness of one or more different portions of the image formed on the display device, a second detector that measures output intensities of the light sources, and a controller that records correlation values that correlate input power settings of the light sources with the detected brightness and the measured output intensities. During operation of the display device, the controller applies the correlation values to determine the proper input power settings of the light sources so that brightness uniformity among the multiple light sources can be achieved.

1 - 20 . (canceled) 
     
     
         21 . A system comprising:
 a display screen having an excitation side and a viewing side;   two or more excitation sources;   a polygon scanner having a plurality of reflective surfaces;   a detector assembly, wherein the detector assembly is disposed on the excitation side of the display screen, wherein the detector assembly is capable of measuring an output intensity of each excitation source at a time interval after each reflective surface has been illuminated with swaths of imaging information to be painted and before a subsequent reflective surface has been illuminated with subsequent swaths of imaging information to be painted; and   a signal modulation controller, wherein the signal modulation controller is capable of directing light to the detector assembly, then the polygon scanner and then the display screen.   
     
     
         22 . The system of  claim 21 , wherein the controller is capable of performing the output intensity measurement during the time interval that occurs between swaths being painted by the set of excitation sources. 
     
     
         23 . The system of  claim 21 , wherein the signal modulation controller is capable of adjusting light emitted from the two or more excitation beams such that output intensity from one excitation source is reduced when compared to another excitation source. 
     
     
         24 . The system of  claim 23 , wherein the signal modulation controller is capable of maintaining a brightness uniformity across the display screen. 
     
     
         25 . The system of  claim 21 , wherein the signal modulation controller is capable of maintaining a brightness uniformity across the display screen. 
     
     
         26 . The system of  claim 21 , wherein the two or more excitation sources comprise a laser array. 
     
     
         27 . The system of  claim 21 , wherein the detector assembly comprises:
 a detector;   a filter;   a collecting dome; and   a current-to-voltage converter circuit.   
     
     
         28 . The system of  claim 27 , further comprising a diode switch coupled to the detector. 
     
     
         29 . The system of  claim 21 , further comprising a beam splitter coupled to the detector assembly. 
     
     
         30 . The system of  claim 21 , further comprising a diode switch coupled to the detector assembly. 
     
     
         31 . The system of  claim 21 , further comprising an imaging lens disposed between the polygon scanner and the display screen. 
     
     
         32 . The system of  claim 21 , further comprising a mirror disposed between the detector assembly and the polygon scanner. 
     
     
         33 . A system comprising:
 a display screen having an excitation side and a viewing side, wherein the display screen is capable of rendering images in a time interval manner;   two or more excitation sources;   polygon scanner having a plurality of reflective surfaces;   a detector assembly, wherein the detector assembly is disposed on the excitation side of the display screen; and   a signal modulation controller, wherein the signal modulation controller is capable of directing light to the detector assembly, then the polygon scanner and then the display screen, wherein the signal modulation controller is capable of adjusting light emitted from the two or more excitation beams such that output intensity from one excitation source is reduced when compared to another excitation source, and wherein the signal modulation controller is capable of maintaining a brightness uniformity across the display screen.   
     
     
         34 . The system of  claim 33 , wherein the controller is capable of applying a known input current to an excitation source. 
     
     
         35 . The system of  claim 33 , wherein the controller is capable of measuring excitation source intensity, and wherein the controller is capable of correlating values of the measured excitation source intensity and adjusting the current of one excitation source to be uniform with a second excitation source. 
     
     
         36 . The system of  claim 33 , wherein the two or more excitation sources comprise a laser array. 
     
     
         37 . The system of  claim 33 , wherein the detector assembly comprises:
 a detector;   a filter;   a collecting dome; and   a current-to-voltage converter circuit.   
     
     
         38 . The system of  claim 37 , further comprising a diode switch coupled to the detector. 
     
     
         39 . The system of  claim 33 , further comprising a beam splitter coupled to the detector assembly. 
     
     
         40 . The system of  claim 33 , further comprising a diode switch coupled to the detector assembly. 
     
     
         41 . The system of  claim 33 , further comprising an imaging lens disposed between the polygon scanner and the display screen. 
     
     
         42 . The system of  claim 33 , further comprising a mirror disposed between the detector assembly and the polygon scanner. 
     
     
         43 . The system of  claim 33 , wherein the display screen comprises a plurality of phosphor stripes.